728406320 has 40 divisors (see below), whose sum is σ = 1767181536. Its totient is φ = 278693888.

The previous prime is 728406319. The next prime is 728406347. The reversal of 728406320 is 23604827.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196097 + ... + 199776.

Almost surely, 2^728406320 is an apocalyptic number.

It is an amenable number.

728406320 is an abundant number, since it is smaller than the sum of its proper divisors (1038775216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

728406320 is a wasteful number, since it uses less digits than its factorization.

728406320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395909 (or 395903 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 728406320 is about 26989.0036866869. The cubic root of 728406320 is about 899.7556208920.

The spelling of 728406320 in words is "seven hundred twenty-eight million, four hundred six thousand, three hundred twenty".